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College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter7: Matrices And Determinants
Section: Chapter Questions
Problem 15T: One hundred liters of a 50% solution is obtained by mixing a 60% solution with a 20% solution. Use a...
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Step 3
Perform row operations to make the nonzero entry in the third row equal to 1.
4
1.
1 0
3
6
7
1
0 1
6
w/
13
0 0
41
41
41
Perform row operations to make the third entries in first and second rows equal to 0.
10 0 :
4
82
82
41
TR3 + R1 -
0 10:
R3 + R2
41
41
41
6.
13
0 0 1
41
41
41
The matrix is now of the form
- lo
...
Transcribed Image Text:Step 3 Perform row operations to make the nonzero entry in the third row equal to 1. 4 1. 1 0 3 6 7 1 0 1 6 w/ 13 0 0 41 41 41 Perform row operations to make the third entries in first and second rows equal to 0. 10 0 : 4 82 82 41 TR3 + R1 - 0 10: R3 + R2 41 41 41 6. 13 0 0 1 41 41 41 The matrix is now of the form - lo ...
Use an inverse matrix to solve (if possible) the system of linear equations.
4x - 2y + 3z = 14
2x + 2y + 5z = 18
Bx - 5y - 2z = 38
Step 1
Recall that if A is an invertible matrix, the system of linear equations represented by AX = B has a unique solution given by
X = A-B. The system of equations is given below.
4x - 2y + 3z = 14
2x + 2y + 5z = 18
8x - 5y - 2z = 38
The system can be represented as a matrix equation AX = B where A is the coefficient matrix and B is the matrix of constant
terms. In order to solve the system, you need to find A.
Use elementary row operations on the doubly augmented matrix
to row reduce A to 1. You can obtain the inverse from
the resultant matrix
4 -2 3 :100
2 2
5:0 10
8 -5 -2 : 0 0 1]
What is the coefficient matrix?
3
A =
8.
-5
|-2
[4,2,3;2,2,5;8,-5,-2]
Step 2
Perform row operations to make the first entries in the second and third rows equal to 0.
4
-2
0 0
R + R2
2
7/2
7/2 1/2
-1/2
1 0
3
-2
0 1
-2 R1 + R3
1.
Perform row operations to make the first nonzero entries in the first and second rows equal to 1.
1
3
1
R.
7
TR2 -
-2
Perform row operations to make the second entries in the first and third rows equal to 0.
4
1 0
3
R2 + R1
7
0 1
R2 + Rg --
-41
13
-41
13
0 0
6.
-10
- |m - m
Transcribed Image Text:Use an inverse matrix to solve (if possible) the system of linear equations. 4x - 2y + 3z = 14 2x + 2y + 5z = 18 Bx - 5y - 2z = 38 Step 1 Recall that if A is an invertible matrix, the system of linear equations represented by AX = B has a unique solution given by X = A-B. The system of equations is given below. 4x - 2y + 3z = 14 2x + 2y + 5z = 18 8x - 5y - 2z = 38 The system can be represented as a matrix equation AX = B where A is the coefficient matrix and B is the matrix of constant terms. In order to solve the system, you need to find A. Use elementary row operations on the doubly augmented matrix to row reduce A to 1. You can obtain the inverse from the resultant matrix 4 -2 3 :100 2 2 5:0 10 8 -5 -2 : 0 0 1] What is the coefficient matrix? 3 A = 8. -5 |-2 [4,2,3;2,2,5;8,-5,-2] Step 2 Perform row operations to make the first entries in the second and third rows equal to 0. 4 -2 0 0 R + R2 2 7/2 7/2 1/2 -1/2 1 0 3 -2 0 1 -2 R1 + R3 1. Perform row operations to make the first nonzero entries in the first and second rows equal to 1. 1 3 1 R. 7 TR2 - -2 Perform row operations to make the second entries in the first and third rows equal to 0. 4 1 0 3 R2 + R1 7 0 1 R2 + Rg -- -41 13 -41 13 0 0 6. -10 - |m - m
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